Actually bad graffiti is not that uncommon, but if you like murals and street art Montreal will not disappoint you. What we have here, is pretty remarkable. In 2013 Montreal hosted its first festival of public art: Mural. It was a big success and has been back every summer since. This year it will be held form June 9-19th.
If you look-up www.artducommun.com you will come to the conclusion that they are not responsible for the bad graffiti on their back door. Artducommun is a collective of professional artists that specializes in murals.